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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6314e4471d798c41f0b6df9d6c4da85f5993a9bb40f19d0d0d4f6df15a1fec0a' 
  AND token = 'p76L5Q0a+qSAHFJkmNsg435N6sbeKqe+i3zxGua2xeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}